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How to Hire a Radon Contractor

Updated

Radon is a naturally occurring radioactive gas that seeps into homes through foundation cracks, gaps, and porous concrete. It's the second leading cause of lung cancer after smoking, and the EPA recommends mitigation for any home testing at or above 4 pCi/L. Radon mitigation typically involves installing an active soil depressurization (ASD) system — a vent pipe and fan that draws radon from beneath the foundation slab and exhausts it above the roofline. Professional radon mitigation systems reduce levels by 80–99% and cost a fraction of what most homeowners expect. Testing is inexpensive and should be done in the lowest livable level of the home.

Typical cost

$800 – $2,500per system

Radon test: $100–$200 (professional). Mitigation system: $800–$2,500 installed. Most homes can be mitigated with a single ASD system. Complex foundations or very high levels may require additional work.

Hiring checklist

  1. 1Look for NRPP or NRSB certified radon measurement and mitigation professionals.
  2. 2Ask about pre- and post-mitigation testing to verify the system achieves levels below 4 pCi/L.
  3. 3Confirm the system includes a U-tube manometer or alarm to indicate fan operation.
  4. 4Get a written warranty guaranteeing radon levels will remain below 4 pCi/L.

Frequently asked questions

  • How much does a radon contractor charge?

    Typical radon costs range from $800 to $2,500 per system. Radon test: $100–$200 (professional). Mitigation system: $800–$2,500 installed. Most homes can be mitigated with a single ASD system. Complex foundations or very high levels may require additional work.

  • Do radon contractors need to be licensed?

    Licensing requirements vary by state. In most states, radon contractors must hold a state license. Always verify the license number with your state's licensing board before work begins.

  • How many estimates should I get?

    Get at least three written estimates for any project over $1,000. Compare line by line — not just the bottom line — to ensure you're comparing equivalent scopes of work.

  • What should be in the contract?

    A written contract should include: full scope of work, materials specified by brand and grade, timeline with start and completion dates, payment schedule tied to milestones, workmanship warranty terms, and a change order process.

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